A dead world. A perfect murder. A secret buried four billion years deep.Dr. Nora Reyes came to the Moon to study the silent history of stone, not to investigate a killing. But when her closest colleague dies during a routine spacewalk on Shackleton Ridge, the official verdict doesn't fit the evidence. A micrometeorite strike, they say. A tragic accident.Marcus Webb was the most meticulous geologist she ever knew. And on the Moon, dust doesn't lie.Scraping anomalous residue from Webb's suit, Nora finds a mineral signature that has no business existing anywhere near the ridge. The moment she tries to log it, her credentials vanish, quietly stripped by base commander David Mercer. As the station's systems tighten around her, Nora is forced into an uneasy alliance with Colt Dawson, a blunt life-support engineer who knows exactly how easy it is to cut off a person's air on a world that has none.Sealed inside a pressurized base 384,000 kilometers from home, the two uncover a truth worth killing for: deep-core drilling has pulled up a crystalline lattice of perfect, engineered geometry. Something that was made. Something far older than humankind.As a corporate lockdown closes in and the oxygen begins to thin, Nora faces the choice her father always warned her against. Speak the truth, no matter the body count.Because beneath the silent regolith, something ancient has just begun to beat.The Shackleton Trilogy begins.